Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AA1TH callsign genealogy
Currently held by KNOWLES, WILLIAM M
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by AA1TH's current licensee, walking backwards.
- KA1QWEcancelledcancelled 1998-02-25
Successor callsigns
Callsigns held now by people who previously held AA1TH.
No current licensee on record previously held this callsign.